I’m sure the chipboard slip case boxes are more durable than the v1 ronwilm’s slip case design, but I used Red River’s 88lb Polar Matte Card stock (13"x19")for the inner and out slip covers and they came out awesome.
I also used the 66lb Polar Matte Double Sided (11x17) for the criterion inserts and lobby cards. 68lb Ultra Pro Satin 8.5x11 for mini poster and envelopes.
It was a fun project…came out really nice.
It sounds like a quality project. Are you able/willing to post up some pics? I would be interested in seeing the final result. Personally, I have never really been happy with the paper stock that I have been limited to, so perhaps taking a page out of your book may yield better results for my own set.